Lathe-chuck



S. D. HOLL ENBECK.

2 Sheets-Sheefi 1.

LATHE GHUGK.

(No Model.)

Patented Mar. 11, 1890.

No. 423,253. Y

I? ZZ (No Model.) 2 Sheets-Sheet 2.

S. D. HOLLENBEOK. LATHE 01111015.

No. 423,253. Patented Mar 11, 1890'.

lllllll! llllll UNITED STATES PATENT OFFICE.

SULLIVAN D. I-IOLLENBEOK, OF ONEIDA, NEIV YORK.

LATHE-CHUCK.

SPECIFICATION forming part of Letters Patent No. 423,253, dated March11, 1890.

Application filed November 18, 1889- Serial No. 330,748. (No model.)

To ctZZ whom it many concern:

Be it known that I, SULLIVAN D. HOLLEN- BECK, of Oneida, in the countyof Madison,

This invention relates to the class of lathe and drill chucks in whichthe gripping-jaws are arranged rotary in the chuck-body and .adjustableuniversally to move synchronously toward and from the axial center ofthe chuck.

The object of this invention is to reduce the diameter of the chuck to aminimum compared with its capacity of holding drills and analogous toolsof various sizes, and also to render the chuck stronger and more durableand less expensive in its manufacture; and to that end the inventionconsists in the novel construction and combination of parts, hereinafterfully described, and specifically set forth in the claims.

In the annexed drawings, Figure 1 is a side view of a chuck embodying myinvention. Fig. 2 is a longitudinal section of the same on line 1 1,Fig. i. Fig. 3 is a face view of the chuck. Fig. l is a transversesection on line as 0:, Fig. 2. Fig. 5 is an end view of the chuck-bodyminus the jaws and end cap. Fig. 6 is atransverse section showingamodification of the form of the jaws and of the means for transmittingmotion from the rotary sleeve to said jaws. Fig. 7 is a longitudinalsection of said modification on line 1 y, Fig.

.6. Fig. Sis a side view of the same. Figs.

9 and 10 are longitudinal sections of further modifications of myinvention. Figs. 11 and 12 are transverse sections on lines a z and 2 zin Figs. 9 and 10. Fig. 13 is a detached side view of the chuck body asconstructed for the adj usting-screw shown in Figs. 10 and 12, and Fig.14: is a detached perspective view of .one of the jaws.

Similar letters of reference indicate corresponding parts.

A represents the chuck body, which is formed with the annular cavity Ain one end and, concentric with the axis of the chuckbody. To the faceend of the said body is attached the cap B, usually by means of screws aa a, passing through the cap and longitudinally in the side of thechuck-body, said cap being provided with the usual central apertureandprojecting over the cavity A sufficiently to retain therein thejaws OO C, and projecting with its outer peripheral portion over the rabbet r,hereinafter described, and for the purposes there explained. The cap mayeither be formed with a sectionof the chuck-body, as shown in Fig. 2 ofthe drawings, or consist simply of an annular plate, as represented inFig. 8 of the drawings. The inner wall of the cavity A is formed withlongitudinal grooves d d cl, which are segmental in cross-section, andfrom each of said grooves extends radially out through the chuck-body anaperture b.

The jaws O O G are each formed with a transversely-rounded back 0 of theform of a longitudinal section of a cylinder by which the jaw is seatedin one of the grooves d. The grooves are slightly larger than asemicircle, so as to prevent the jaws from dropping out of the same whenthe chuck is not in use. Said grooves extend throughout the length ofthe cavity A to allow the jaws C C C to be inserted with their backs c ccendwise into the grooves, the cap B serving to retain the jaws in thebody, as before mentioned. The jaws are thus seated rotatively in thechuck-body and are sustained throughout theirlengths, so as toeffectually resist the outward strain when in operation. I

From the back of each jaw projects a crankarin Z, which extends throughone of the apertures b Z) of the chuck-body. The exterior of thechuck-body is formed with a smooth circumferential rabbet r, in which isseated a sleeve D, which has its inner side likewise smooth and'providedwith recesses or sockets e c, into which the ends of the crank-arms Z ZZare fitted, so that by turning the said sleeve all of the said crankarms are moved in unison, and this movement causes the jaws C O O tosynchronously approach or recede from the center of the chuck, accordingto the direction in which the sleeve is turned. projection of the cap 13over the rahbet '1, as hereinbefore described, serves to restrainlongitudinalmovement of the sleeve and to retain the same on the body.If desired, the

crank-arms Z Z I may be formed with cogs on The IOU

their ends and the interior of the sleeve D provided with correspondingcogs meshing with those of the crank-arms, as shown in Fig. 6 of thedrawings.

For the purpose of retaining the jaws more securely in their adjustedposition a suitable tightener may be interposed between the sleeve D andbody A. One form of such a tightener is shown in Figs. '7 and 8 of thedrawings, and consists of a roller 2', pivoted eccetitrically to thechuck-body and adapted to bear with its periphery on the end of thesleeve D. In turning the sleeve to set the jaws O O G into theirgripping position the roller 2' is to be turned so as to bring it out ofcontact with the sleeve D, and after the jaws have been tightened on thedrill gripped between them the aforesaid roller is to be turned so as tocause its periphery to tightly engage the sleeve in such a directionthat a reverse movement of the sleeve Will cause the roller to pressmore tightly against the sleeve. In lieu ofthe aforesaid roller may beused an adjusting-screw 7L, seated by one-half of its thickness in asmooth groove 0, which extends preferably tangentially through the sideof the sleeve D and terminates with outward shoulders 0 0 at oppositeends, as shown in Figs. 10 and 12 of the drawings. The screw is formedat opposite ends with heads h h, which abut against the shoulders 0 0,and thereby prevent the screw from traveling endwise. The exterior ofthe chuckbody is formed with a circumferential groove 25, which issemicircular in cross-section and of the same diameter as the screw, andis formed with screw-threads corresponding to and engaging with thescrew. a

Although I prefer the said arrangement of the screw in relation to thechuck=body and sleeve on account of its obviating undue proj ections onthe exterior of the chuck, yet the same may be modified by forming thesmooth seat for the screw in a flange u, projecting over a portion ofthe sleeve and providing the latter with the screw-threadedcircumferential groove for engagement with the adj usting-screw h, asshown in Figs. 9 and 11' of the drawings. By turning the screw in eithercase rotary motion is imparted to the sleeve D, which actuates the jawsin the manner hereinbefore described.

To adapt the chuck for holding fine tools and for operating in recessedobjects, I form the outer ends of the jaws C O tapering toward the axisof the chuck and of a length to cause them to protrude through the capB, as shown in Fig. 10 of the drawings.

Having described my invention,what I claim as new, and'desire to secureby Letters Patent, is-

1. The combination of the chuck-body formed with a central cavity,longitudinal grooves in the sides of the cavity, and the jaws formedwith transversely-rounded backs and seated thereby in the aforesaidgrooves, substantially as described and shown.

2. The combination of the chuck body formed with an annular centralcavity, longitudinal grooves in the sides of the cavity and aperturesthrough the wall of the cavity,

jaws formed with transversely-rounded backs and seated thereby in theaforesaid grooves and having crank-arms projecting through the aforesaidapertures, and a rotative sleeve on-the exterior of the body engagingthe ends of the aforesaid crank-arms, substantially as I described andshown.

in said cavity, a rotative sleeve on the exterior of the body actuatingthe jaws and formed with a smooth tangential groove terminating withshoulders at opposite ends, a circumferential screw-threaded groove inthe exte' rior of the chuck-body, and a screw seated in the groove ofthe sleeve and engaging the screw-threads of the groove in thechuckbody, substantially as described and shown. In testimony whereof Ihave hereunto signed my name this 9th day of November, 1889.

SULLIVAN D. I'IOLLENBECK. [L. s] Witnesses:

T. H. J URDEN, NELsoN G. STARK.

5. The combination of a chuck-body formed

